Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/brucemcpherson/gas-fakesnpx agentmods add skills/brucemcpherson/gas-fakes/gf-agent-contributorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor)<a href="https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor"><img src="https://agentmods.dev/badge/skills/brucemcpherson/gas-fakes/gf-agent-contributor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor"><img src="https://agentmods.dev/badge/skills/brucemcpherson/gas-fakes/gf-agent-contributor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00040 | $0.00870 |
| Opus 5 | $0.00020 | $0.00435 |
| Sonnet 5 | $0.00008 | $0.00174 |
| Haiku 4.5 | $0.00004 | $0.00087 |
Grade A, and why
gf-agent-contributor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: gf-agent-contributor
Overview
This skill provides instructions on how to correctly contribute knowledge, best practices, or API parity warnings to the gf_agent so that it learns how to write better Google Apps Script automation code.
The Architecture
To prevent Git merge conflicts between multiple developers, the monolithic gf_agent/SKILL.md file is auto-generated. You MUST NOT edit gf_agent/SKILL.md directly.
Instead, gf_agent uses a modular knowledge base. The builder.js script aggregates all markdown files in the gf_agent/knowledge/ directory and appends them to a base template (gf_agent/scripts/SKILL.template.md).
How to Contribute Knowledge
When you need to teach gf_agent something new, you must first ensure you are working from a local Git clone, NOT the cached Gemini skills folder.
-
Clone the gf_agent Environment (Sparse Checkout): Because
gf_agentis a subfolder of the largergas-fakesrepository, you should use Git's Sparse Checkout feature to download only thegf_agentdirectory.🤖 Agent Instruction: If the user is not yet in a configured workspace, offer to run the sparse checkout setup for them! If they agree, use
run_shell_commandto execute this exact sequence (adjust the parent directory if they specify one):mkdir gf_agent_standalone && cd gf_agent_standalone git init git remote add origin https://github.com/brucemcpherson/gas-fakes.git git config core.sparseCheckout true echo "gf_agent/*" >> .git/info/sparse-checkout git pull origin main gemini skills link ./gf_agent(If the user prefers to do it manually, provide them the script above).
-
Create a Modular File: Navigate to the
gf_agent/knowledge/directory inside your new standalone environment. Create a new markdown file for your topic.- Use a numeric prefix to ensure it sorts correctly during compilation if order matters (e.g.,
06-new-feature.md). If it is a standalone topic, any descriptive name is fine.
- Use a numeric prefix to ensure it sorts correctly during compilation if order matters (e.g.,
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 57 lines · 40 tokens per session scan A f03cb3d893b6
gf-agent-contributor is a skill published in the GitHub repository brucemcpherson/gas-fakes (79 stars, last pushed 3d ago), licensed MIT. It adds 40 tokens to every session and 870 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.
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